Circular saw reconditioning rig



Nov. 9, 1948. A. B. NIETFELD I 2,453,638

CIRCULAR SAW REGONDITIONING RIG I V Filed June so, 1947 N 2 Sheets-Sheet'i Inventor Albert E. Nieffeld WWW Nov. 9, 1948.. A. B. NIETFELD 2,453,638 CIRCULAR SAW RECONDITIONING RIG Filed J1me so, 1941 2 Sheets-Sheet 2 WNW I5 bz ventar Albert E. N/effe/d {Thi inventio part of this application, I

Figure 1 is a plan viewof the -5 of Figure 1; and H Figure-=6 is a sectional viewtaken on the line Patented Nov. 9, 1948 cular saw reconditioning rigs. i

An object of the invention is to provide an impr ved circular saw reconditioning rig for giving sawiteeth r n Another object of the invention is to provide animproved circularsaw reconditioning rig havinjgf adjustm ent for gumming gulletstd uniform depth and 'for joining the rim o f fthe saw to a true circle.

A further objectof the invention is to provide anlfimproved circular saw reconditioning, rig

which will includemeans for sharpening the teeth fa rotary orcircular saw with any desired angleandslope.

Another object of theinvention is to provide an improved circular saw reconditioning "rig whichwill be highlyljefilcient in operation, and

relativelyinexpensive to manufacture andprd- "duce.

Other objects will appear as the description In" the accompanying drawings whichi fbrm a cular saw reconditioning rig;

Figure 2 is an end elevation of the improved circular saw reconditioning rig;

Figure 3 is a side elevation of Figure 4 is a sectional view taken on the line 4-4 ofFigu re 1; H v

Figure 5isa sectional view taken on the line Like characters of reference are used throughout the following specification" and the accompanying drawings to designate corresponding parts.

In carrying out the invention, there is devised and provided an improved circular saw reconditioning rig including a pair of longitudinally spaced transversely extending inverted U-shape supporting frame members I and 2, whose lower ends are secured to the L-shape angle iron bracket members 3 and 4 by means of the bolts 5, said bracket members 3 and 4 being fixed to any desired support or supporting surface 6, as clearly illustrated in Figures 2, 3 and 6 of the drawings. a

A pair of transversely spaced, longitudinally extending supporting rails 1 and 8 are secured to and between the opposite ends of the inverted relates to improvements in ciranyfdesired angle of moraine faces the improved cirthe improved "circular saw reconditioning rig; i

tmb STATE-S tim and u having elongated, inwardly directe of the screw bolts sions l2 and is thereof, forfthelongitud U-sh'ape supporting f rjame]members l means of it the" screw bolts 9Q while; cjo'o oppositely disposed j L-shape supporting ar tensions l2 and l 3,respective1y, are also ported on the supporting rails] and 8 by' An inverted U-shape frame lly extending securing endfianges'or tabs ,l5 is B- cured to the outer bolts 9servingfas als bi iiltt with said L-shaped supp rting arms, endm ife particularly with thefinwardly extending e ennel extending worksupporting benchmem e 6L and 16' which are spaced apartto' providethe longitudinally extending guide slot II for adjustably receiving the upwardly extending" arbortshaft orboltlB. A guide washer l9 willbe disposedlon the lower end of the arbor Orton Hi to underlie the adjacent lower edgesof the workj supporting bench members l6, andiG', for guiding thejcircular saw 20 when supported upon said arbonor bolt I8 in a'horizontal planeand incontact with the upper surfaces of said Ubencdmemb "l6 aIldlG'. i f; 1 saw clamping bar 21 willebe rotatablysup- 7 ported upon the upwardly extending bolt flextending through the bench member I 6;

y will be held in the d X justed fpositiondn contact with the uppersurface of the circular saw '21: by means of the washer zsarfia cqop r ting operating lever 24 upon which'the h die 25 is supported. A coilspring 25 ivillb sp b about the bolt 22 between thebenchmember 1'6 and the saw clamping bar 2| for resilient l forcing or raising the clampinglflbar 2| e locksaw 20 in fixed position. i

A tubular motor supporting bar 21 is secured longitudinally and centrally of therig,being fastened to the inverted U-shape supporting frame ing bolt 22 is notthreaded'down to campsite member 2, and at its opposite end being fastened motor cradle. A grinding'wheel 51 of any desired type will,

A pair of parallel extending u-shape motor.

supporting members and 4| will be supported upon the upper surface of the upper disk-shape supporting plate 38 by means of the rivets 42, and

the upper ends of the arms of said members 40 end of said bench member for holding said saw in and 4| will be formed with aligned apertures for slidably receiving the parallel extending, adjustable motor-supporting rods 43 and 44.

An electric motor 45 will be supported upon the upper'edges of a U-shape yokeplate 46 which is,

in turn, supported upon a fiat plate 41; and cooperates with the motor encircling metal strap 48,

one end of which is bent inwardly, as at 49, and is apcrture'd to receive the securing bolt 50 which i extends therethrough and thru'the plate 41 and base of the yoke mount for the motor 45. The

opposite depending end of the motor encircling strap 48 is bent outwardly,"asat 5|, and is apertur'ed, to receive the securing bolt '52 extending 'therethrough and through the fiat plate 41.

, C0il tensioning springs 53 and 54 will bedisposed about themotor cradle supporting rods 43 and",44,between the adjacent side of the yoke plate 46 and the adjacent inner surfacesof the parallel" extending U-shape motor supporting members 40 and 4| for normally urging the motor 45 and its supporting cradle toward the circular saw 20 when supported upon the bench members l6 and I6. An adjustable tensioning' or stop collar 55 will be held by the set screw .55 upon the rod '44 for limiting the outward movement of the be secured on the shaft '58 of the electric motor '45 for grinding'the saw teeth 31 and for gumming the gullets to uniform depth, and for joiningthe rim of the saw to a true circle.

Erom'the' foregoing description, it will be seen that there has'been devised and provided a highly eflicient form of circular saw reconditioning rig which will be relatively inexpensive to manufact'ure'and produce.

" Whil'ethe preferred embodiment of the instant invention has been illustrated and described, it

will'b'e understood that it is not intended to limit the scope of the invention thereto, as many minor changes in detail of construction may be resorted to without departure from the spirit of the invention.

Having described the invention, what is claimed as new is:

1. A circular saw reconditioning rig including a supporting frame having parallel longitudinally extending supporting rails, a frame supported on one end of said rails, a work support on said lastmentioned frame comprisingspaced-bench members having a longitudinally extending guide channel formed therebetween, a saw supporting arbor adjustably supported for movement in said guide channel, pivoted clamping means onone .2. A circular saw reconditioning rig including "a, supporting frame having parallel longitudinally extending supporting rails, an elevated frame supported at one end of said supporting rails, a work support onlsaidlast-mentioned frame] com- 1 prising spaced jbench'member's having a longitudinally extending guidef channel formed therebetween, a saw supporting arbor adjustably supported formovement in said guide channel, pivotedicla'm ine' means on one of said'bnch members for holdingsaid saw in fixed position, a supporting bar mounted longitudinally of'said frames, a motor supporting cradle rotatably'and tiltably mounted on said supporting ban, a vise clamp for holding said cradle in fixed position, motor supporting rods slidably disposed in said cradle, a motor and grinding wheel detachably mounted upon said rods, and resilient feed means on saidrod for normally urging said motor and grinding wheel toward the Work to be ground.

3. The subject matter as claimed in claim 2, and an adjustable stop collar on oneof said rods for limiting the adjustment of said motor and grinding wheel on said supporting rods.

ALBERT B. NIETFELD.

REFERENCES CITED The following references are of record in the file of this patent: l

UNITED STATES PATENTS 

